linux-kernel - Re: [PATCH 00/21] add and use devm_irq_of_parse_and

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Date:	Mon, 16 Jun 2014 12:36:34 +0400
From:	Nikita Yushchenko <nyushchenko@....rtsoft.ru>
To:	Andreas Larsson <andreas@...sler.com>
CC:	lugovskoy@....rtsoft.ru, Grant Likely <grant.likely@...aro.org>,
	Rob Herring <robh+dt@...nel.org>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
	sparclinux@...r.kernel.org, davem@...emloft.net
Subject: Re: [PATCH 00/21] add and use devm_irq_of_parse_and_map()

>>> SPARC does not use OF_IRQ and has a different implementation of
>>> irq_of_parse_and_map than the one in drivers/of/irq.c. All code
>>> converted from irq_of_parse_and_map to devm_irq_of_parse_and_map in this
>>> patch set will be unlinkable for SPARC. This includes SPI in general and
>>> many drivers that are used for SPARC (of which several are currently
>>> only used on SPARC platforms).
>>
>> Can this be fixed by adding a copy of devm_irq_of_parse_and_map() to
>> arch/sparc/kernel/of_device_common.c ?
> 
> Not a copy of the version in irq.c no. On SPARC, IRQ_DOMAIN is not
> selected in general.
> 
> However, there is no technical problem that I can see with having a
> SPARC version of devm_irq_of_parse_and_map that just calls
> irq_of_parse_and_map as there are no mappings that needs to be disposed
> of. (The empty dummy for irq_dispose_mapping is used if any
> irq_dispose_mapping calls are made from drivers).

Ok, I will post an updated patchset that adds sparc
devm_irq_of_parse_and_map() that just calls irq_of_parse_and_map(), and
devm_irq_dispose_mapping() that does nothing.

Also, you mentioned that some drivers that my original patchset touches
are sparc-only?  Then, maybe better not convert these to devm_? Could
you please give a list of such drivers?

Nikita

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